Make double and freeze the extra portions - you only spend one night out of 2 cooking. By doing this a few times you can build up a variety of meals in the freezer.
The other thing I do is bulk make things like mashed potato or potato gratin or other side dishes and freeze. Make a meal in the slow cooker (with plenty of veg in) and then nuke the mash from the freezer which saves effort.
Frozen veg are as good, sometimes better than fresh veg and quicker to cook as they don't need any preping. My kids have always liked the mixes of diced carrot/peas/sweetcorn/green beans or similar (most places doing something along those lines).
Slow cooker is more a reorganisation of time than actually time saving but I find it useful as I can prep stuff while kids are asleep/at school or napping.
Economy gastronomy used the ideas of 'tumble down recipes' - so make a big pot of mince. 1 day have it as spag bol, next day add some spices and kidney beans and serve with rice or tortillas as chilli con carne, you can do shepherd/cottage pie with it. If you don't fancy mince that many times in a row freeze in portions and serve later.
I do a big pulled pork and freeze. Nuke in microwave and serve with wraps, grated cheese, salad stuff or roasted veg, maybe some spicy rice and beans. Quick to prepare and lay out. Instead of pulled pork you can do chicken or mince or pretty much anything you fancy.
Baked potatoes with cheese/beans or tuna and salad or chilli or curry - various toppings all well balanced meal.
SOmething that goes down well with mine (and I love doing as a quick no effort dinner) - pork chops (marinated in balsamic vinegar and rosemary/black pepper) served with crusty bread and salad.
Decent sausages with roasted mushrooms/peppers/onions (chopped up and chucked in tray with sausages) served with potatoes or bread.
Omelettes with leftover veg served with baked beans or salad.
Homemade pizzas but made with tortillas or french bread as a base. Serve with veg sticks
Homemade soup followed by a fruit based pudding (e.g. fruit crumble).